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builtin.go
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builtin.go
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/*
Copyright 2021 The GoPlus Authors (goplus.org)
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package cl
import (
"go/token"
"go/types"
"github.com/goplus/gox"
)
// -----------------------------------------------------------------------------
func toIndex(c byte) int {
if c >= '0' && c <= '9' {
return int(c - '0')
}
if c >= 'a' && c <= 'z' {
return int(c - ('a' - 10))
}
panic("TODO: invalid character out of [0-9,a-z]")
}
func initGopPkg(pkg *types.Package) {
scope := pkg.Scope()
overloads := make(map[string][]types.Object)
names := scope.Names()
for _, name := range names {
if n := len(name); n > 3 && name[n-3:n-1] == "__" { // overload function
key := name[:n-3]
overloads[key] = append(overloads[key], scope.Lookup(name))
}
}
for key, items := range overloads {
off := len(key) + 2
fns := make([]types.Object, len(items))
for _, item := range items {
idx := toIndex(item.Name()[off])
if idx >= len(items) {
panic("overload function must be from 0 to N")
}
if fns[idx] != nil {
panic("overload function exists?")
}
fns[idx] = item
}
scope.Insert(gox.NewOverloadFunc(token.NoPos, pkg, key, fns...))
}
}
func initMathBig(pkg gox.PkgImporter, conf *gox.Config, big *gox.PkgRef) {
big.EnsureImported()
conf.UntypedBigInt = big.Ref("Gop_untyped_bigint").Type().(*types.Named)
conf.UntypedBigRat = big.Ref("Gop_untyped_bigrat").Type().(*types.Named)
conf.UntypedBigFloat = big.Ref("Gop_untyped_bigfloat").Type().(*types.Named)
initGopPkg(big.Types)
}
func initBuiltin(pkg gox.PkgImporter, builtin *types.Package, fmt, big *gox.PkgRef) {
scope := builtin.Scope()
typs := []string{"bigint", "bigrat", "bigfloat"}
for _, typ := range typs {
scope.Insert(types.NewTypeName(token.NoPos, builtin, typ, big.Ref("Gop_"+typ).Type()))
}
fns := []string{"print", "println", "printf", "errorf", "fprint", "fprintln", "fprintf"}
for _, fn := range fns {
fnTitle := string(fn[0]-'a'+'A') + fn[1:]
scope.Insert(gox.NewOverloadFunc(token.NoPos, builtin, fn, fmt.Ref(fnTitle)))
}
}
func newBuiltinDefault(pkg gox.PkgImporter, prefix string, conf *gox.Config) *types.Package {
builtin := types.NewPackage("", "")
fmt := pkg.Import("fmt")
big := pkg.Import("github.com/goplus/gop/builtin")
initMathBig(pkg, conf, big)
initBuiltin(pkg, builtin, fmt, big)
gox.InitBuiltinOps(builtin, prefix, conf)
gox.InitBuiltinAssignOps(builtin, prefix)
gox.InitBuiltinFuncs(builtin)
return builtin
}
// -----------------------------------------------------------------------------